Marathon des Sables
Marathon des Sables is a six-day, 251 km (156 mi) ultramarathon, which is the equivalent of six regular marathons. The longest single stage (2009) is 91 km (57 mi) long.This multiday race is held every year in southern Morocco, in the Sahara desert. It is considered the toughest foot race on Earth. The first event of the Marathon started in 1986.